25223205540 has 96 divisors (see below), whose sum is σ = 76192212096. Its totient is φ = 6197806080.

The previous prime is 25223205523. The next prime is 25223205571. The reversal of 25223205540 is 4550232252.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 25223205498 and 25223205507.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 417064 + ... + 473696.

It is an arithmetic number, because the mean of its divisors is an integer number (793668876).

Almost surely, 2^25223205540 is an apocalyptic number.

25223205540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25223205540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38096106048).

25223205540 is an abundant number, since it is smaller than the sum of its proper divisors (50969006556).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25223205540 is a wasteful number, since it uses less digits than its factorization.

25223205540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57229 (or 57227 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 30.

Adding to 25223205540 its reverse (4550232252), we get a palindrome (29773437792).

The spelling of 25223205540 in words is "twenty-five billion, two hundred twenty-three million, two hundred five thousand, five hundred forty".